CN110066661B - Retaining wall slurry for underground continuous wall of deep and large foundation pit in gravel stratum and preparation method of retaining wall slurry - Google Patents
Retaining wall slurry for underground continuous wall of deep and large foundation pit in gravel stratum and preparation method of retaining wall slurry Download PDFInfo
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Abstract
The invention relates to the field of building construction, and provides underground diaphragm wall protecting slurry for a deep and large foundation pit in a round gravel stratum, which comprises the following raw materials in parts by weight: 1000 parts of water, 75-85 parts of bentonite, 3-5 parts of soda ash and 0.5-1.5 parts of sodium polyacrylate. The invention also provides a preparation method of the retaining wall slurry for the underground continuous wall of the deep and large foundation pit in the gravel stratum. The invention has the advantages that: the invention adopts sodium polyacrylate to replace the traditional CMC, the slurry wall protection performance and the slurry recycling rate are greatly improved, and simultaneously, the corresponding environmental pollution and material consumption are reduced; meanwhile, various indexes of the slurry prepared according to the formula can meet the requirements of the index of the circulating slurry, the wall protection effect is good, and the stability of the wall of the tank is good.
Description
Technical Field
The invention relates to the field of building construction, in particular to a retaining wall slurry for an underground continuous wall of a deep and large foundation pit in a gravel stratum and a preparation method thereof.
Background
The underground continuous wall has the advantages of mature process, high rigidity, good integrity, good water stopping effect and the like, and becomes a more widely applied enclosure structure form in the construction of each foundation pit in recent years. In the process of grooving construction of the underground continuous wall, the wall protection slurry can be deposited on the surface of the groove wall to form a mud skin, so that the groove wall is protected. Meanwhile, the water and soil pressures of the slurry and the soil layer in the tank are balanced, and the tank wall is kept stable and does not collapse.
For the underground diaphragm wall of the deep and large foundation pit, as the grooving depth is large, the procedures of grooving detection, steel reinforcement cage lowering, pouring conduit installation and the like are carried out after grooving, so that the mud standing time after grooving is longer. Therefore, the quality of the mud performance directly influences the construction quality of the underground continuous wall.
At present, most of traditional slurry which is relatively common in application is prepared by using CMC (sodium carboxymethylcellulose) as a tackifier, the index of the traditional slurry is far from meeting the wall protection requirement of the underground continuous wall of the deep and large foundation pit, the shrinkage cavity of the wall or the local collapse of the wall are easy to occur, and the joint of the wall is easy to have common quality problems of water leakage and the like caused by mud inclusion and sand inclusion. In addition, in the stratums with poor self-stability and strong water permeability, such as similar round gravel stratums, the stability of indexes such as specific gravity, pH value and viscosity of the traditional slurry is also easily influenced by underground water, and the stability of the wall of the trench cannot be effectively ensured in the trench forming construction process of the underground diaphragm wall of the deep and large foundation pit. Meanwhile, the traditional slurry also has the problem of high waste slurry rate, and is not beneficial to environmental protection.
Accordingly, the retaining wall slurry for the underground continuous wall of the deep and large foundation pit in the gravel stratum and the preparation method thereof are urgently needed, wherein the retaining wall slurry has good retaining wall performance, good grooving quality, high slurry recycling rate and environmental protection.
Disclosure of Invention
The invention aims to provide the underground continuous wall retaining slurry for the deep and large foundation pit in the gravel stratum and the preparation method thereof, wherein the underground continuous wall retaining slurry has the advantages of good wall retaining performance, good grooving quality, high slurry recycling rate and environmental friendliness.
The invention adopts the following technical scheme to solve the technical problems:
the wall protection slurry for the underground continuous wall of the deep and large foundation pit in the gravel stratum comprises the following raw materials in parts by weight: 1000 parts of water, 75-85 parts of bentonite, 3-5 parts of soda ash and 0.5-1.5 parts of sodium polyacrylate.
As one of the preferable modes of the invention, the feed comprises the following raw materials in parts by weight: 1000 parts of water, 80 parts of bentonite, 4 parts of soda ash and 1 part of sodium polyacrylate.
As one of the preferable modes of the invention, the feed comprises the following raw materials in parts by weight: 1000 parts of water, 78 parts of bentonite, 3.5 parts of soda ash and 0.8 part of sodium polyacrylate.
As one of the preferable modes of the invention, the feed comprises the following raw materials in parts by weight: 1000 parts of water, 83 parts of bentonite, 4.5 parts of soda ash and 1.2 parts of sodium polyacrylate.
In a preferred embodiment of the present invention, the feed water is specifically derived from underground water extracted from a well and has a pH of 6 to 7, and is used after passing the detection.
In a preferred embodiment of the present invention, the soda ash is industrial soda ash, and the pH of the soda ash is 8 to 10 after the soda ash is mixed with the raw material water.
In a preferred embodiment of the present invention, the sodium polyacrylate is food grade sodium polyacrylate, and is used as a tackifier.
A preparation method of underground continuous wall retaining mud for a gravel stratum deep and large foundation pit comprises the following specific steps:
(1) weighing the raw materials in parts by weight;
(2) injecting water with the corresponding weight part into a slurry mixing pool, and starting a stirrer to stir the water;
(3) firstly pouring bentonite into a slurry mixing pool, then scattering caustic soda into the slurry mixing pool by using a measuring cup, and finally scattering sodium polyacrylate into the slurry mixing pool by using the measuring cup;
(4) after the material spreading is finished, mixing and stirring for 5-8 min; when the bentonite is fully dispersed, pumping the mixture into a new slurry pool;
(5) after 20-28h, the bentonite particles are fully hydrated and expanded to prepare the target required slurry.
In a preferred embodiment of the present invention, after the slurry required for the object is prepared, the performance index is measured, and the slurry can be used after passing the detection.
As one of the preferred modes of the invention, the slurry is particularly suitable for underground continuous walls which are more than 70m deep and 1.5m thick in the gravel stratum.
The effects of the raw materials are as follows:
water: the field slurry mixing water source can adopt underground water extracted by well drilling; and after the underground water is qualified through detection, the underground water is used as slurry.
Bentonite: the bentonite is used for improving the plastic viscosity, static shearing force and dynamic shearing force of a slurry system, so that slurry forms a layer of thin compact mud skin on the wall of the tank, the wall of the tank is reinforced, and the collapse of a rock stratum is prevented; the bentonite can be used after the performance of the bentonite meets the requirements through test detection;
soda ash: soda ash is used as a dispersant in the preparation of slurry; since the pH value of water is generally between 6 and 7, but the pH value of slurry is required to be between 8 and 10, industrial soda ash is required to adjust the pH value of water to be between 8 and 10.
Sodium polyacrylate: the sodium polyacrylate is a novel functional polymer material, the solid product is white (or light yellow) block or powder, and can be used as a tackifier to replace CMC after being added into slurry.
Compared with the prior art, the invention has the advantages that:
the main components of the mud comprise water, bentonite, soda ash and sodium polyacrylate, wherein the sodium polyacrylate is used as a tackifier; the invention adopts sodium polyacrylate to replace the traditional CMC, the slurry wall protection performance and the slurry recycling rate are greatly improved, and the corresponding environmental pollution and material consumption are reduced; meanwhile, various indexes of the slurry prepared according to the formula can meet the requirement of the index of the circulating slurry, the index of the waste slurry is not reached, the slurry wall protection effect is good, and the stability of the wall of the tank is good.
In conclusion, in the grooving construction process of the underground diaphragm wall of the deep and large foundation pit in the gravel stratum, the sodium polyacrylate is used as the tackifier, so that the slurry performance can be effectively improved, the waste slurry rate is greatly reduced, and the wall protection performance and the environmental protection effect are good in the construction similar to the underground diaphragm wall.
Drawings
FIG. 1 is a flow chart of a method for preparing retaining wall slurry for an underground diaphragm wall of a deep and large foundation pit in a gravel stratum in example 6.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Example 1
The underground diaphragm wall retaining slurry for the gravel stratum deep and large foundation pit comprises the following raw materials in parts by weight: 1000 parts of water, 75 parts of bentonite, 3 parts of soda ash and 0.5 part of sodium polyacrylate.
Wherein the raw material water is sourced from underground water extracted from well drilling, has pH of 6, and is used after being detected to be qualified; the soda adopts industrial soda, and after being mixed with raw material water, the pH value is 8; the sodium polyacrylate is food grade sodium polyacrylate and is used as tackifier.
Example 2
The underground diaphragm wall retaining slurry for the gravel stratum deep and large foundation pit comprises the following raw materials in parts by weight: 1000 parts of water, 85 parts of bentonite, 5 parts of soda ash and 1.5 parts of sodium polyacrylate.
Wherein the raw material water is sourced from underground water extracted from well drilling, has pH of 7 and is used after being detected to be qualified; the soda ash adopts industrial soda ash, and after being mixed with raw material water, the pH value is 10; the sodium polyacrylate is food grade sodium polyacrylate and is used as tackifier.
Example 3
The underground diaphragm wall retaining slurry for the gravel stratum deep and large foundation pit comprises the following raw materials in parts by weight: 1000 parts of water, 80 parts of bentonite, 4 parts of soda ash and 1 part of sodium polyacrylate.
Wherein the raw material water is sourced from underground water extracted from well drilling, has pH of 6.5, and is used after being detected to be qualified; the soda ash adopts industrial soda ash, and after being mixed with raw material water, the pH value is 9; the sodium polyacrylate is food grade sodium polyacrylate and is used as tackifier.
Example 4
The underground diaphragm wall retaining slurry for the gravel stratum deep and large foundation pit comprises the following raw materials in parts by weight: 1000 parts of water, 78 parts of bentonite, 3.5 parts of soda ash and 0.8 part of sodium polyacrylate.
Wherein the raw material water is sourced from underground water extracted from well drilling, has pH of 6.2, and is used after being detected to be qualified; the sodium carbonate is industrial sodium carbonate, and after being mixed with raw material water, the pH value is 8.5; the sodium polyacrylate is food grade sodium polyacrylate and is used as tackifier.
Example 5
The underground diaphragm wall retaining slurry for the gravel stratum deep and large foundation pit comprises the following raw materials in parts by weight: 1000 parts of water, 83 parts of bentonite, 4.5 parts of soda ash and 1.2 parts of sodium polyacrylate.
Wherein the raw material water is sourced from underground water extracted from well drilling, has pH of 6.8, and is used after being detected to be qualified; the sodium carbonate is industrial sodium carbonate, and after being mixed with the raw material water, the pH value is 9.5; the sodium polyacrylate is food grade sodium polyacrylate and is used as tackifier.
Example 6
In this embodiment, as shown in fig. 1, a method for preparing the retaining mud for the underground diaphragm wall of the deep and large foundation pit in the gravel stratum in the above embodiments 1 to 5 includes the following specific steps:
(1) weighing the raw materials in parts by weight;
(2) injecting water with the corresponding weight part into a slurry mixing pool, and starting a stirrer to stir the water;
(3) firstly pouring bentonite into a slurry mixing pool, then scattering caustic soda into the slurry mixing pool by using a measuring cup, and finally scattering sodium polyacrylate into the slurry mixing pool by using the measuring cup;
(4) after the material spreading is finished, mixing and stirring for 5-8 min; when the bentonite is fully dispersed, pumping the mixture into a new slurry pool;
(5) after 20-28h, fully hydrating and expanding the bentonite particles to prepare the slurry required by the target;
(6) and (4) after the slurry required by the target is prepared, measuring the performance index of the slurry, and using the slurry after the slurry is qualified.
The main components of the slurry of the embodiment comprise water, bentonite, soda ash and sodium polyacrylate, and the slurry is particularly suitable for underground continuous walls with the depth of more than 70m and the thickness of 1.5m in a round gravel stratum; the sodium polyacrylate is adopted to replace the traditional CMC, the wall protection performance of the slurry and the recycling rate of the slurry are greatly improved, and meanwhile, the corresponding environmental pollution and material consumption are reduced; meanwhile, each index of the slurry prepared according to the formula of the embodiment can meet the requirement of the index of the circulating slurry, and the slurry has good wall protection effect and good stability of the wall of the tank.
In the Kunming track traffic No. 4 line engineering, the slurry preparation process is approved by construction units, design units and supervision units, and is vigorously popularized. The method is applied to construction of ultra-deep and ultra-thick diaphragm walls in a north station of a Kunming train. And 5 walls are subjected to entity detection by spot inspection in the construction process, and the qualification rate is 100%. Meanwhile, the messy condition of dirty, messy and poor slurry construction is greatly improved, and the workshop type production management shows good project image.
Example 7
This example illustrates the comprehensive properties of the retaining mud for the underground diaphragm wall of the deep and large foundation pit in the gravel stratum in the above examples 1-5:
the performance ratio of each retaining wall slurry is shown in table 1, and the viscosity, specific gravity, fluid loss and sludge film thickness are used as evaluation indexes; in comprehensive comparison, the slurry in example 3 is found to have the best performance and be the optimal proportioning.
TABLE 1 comparison of the overall Properties of the slurries of examples 1-5
| Slurry sample | Viscosity (S) | Specific gravity of | Fluid lossVolume (mL) | Mud film thickness (mm) |
| Example 1 | 20 | 1.03 | 14 | 3 |
| Example 2 | 21 | 1.13 | 14 | 3 |
| Example 3 | 25 | 1.10 | 12 | 2 |
| Example 4 | 23 | 1.04 | 13 | 2 |
| Example 5 | 24 | 1.11 | 13 | 3 |
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The underground continuous wall retaining mud for the gravel stratum deep and large foundation pit is characterized by comprising the following raw materials in parts by weight: 1000 parts of water, 75-85 parts of bentonite, 3-5 parts of soda ash and 0.5-1.5 parts of sodium polyacrylate; wherein the raw water is particularly derived from underground water extracted from a well and has a pH of 6-7; the sodium carbonate is specifically industrial sodium carbonate, and after being mixed with raw material water, the pH value is 8-10; the sodium polyacrylate is food-grade sodium polyacrylate serving as a tackifier; the mud is suitable for underground continuous walls with the depth of more than 70m and the thickness of 1.5m in round gravel stratum.
2. The wall protection slurry for the underground continuous wall of the deep and large foundation pit of the round gravel stratum as claimed in claim 1, which is prepared from the following raw materials in parts by weight: 1000 parts of water, 80 parts of bentonite, 4 parts of soda ash and 1 part of sodium polyacrylate.
3. The wall protection slurry for the underground continuous wall of the deep and large foundation pit of the round gravel stratum as claimed in claim 1, which is prepared from the following raw materials in parts by weight: 1000 parts of water, 78 parts of bentonite, 3.5 parts of soda ash and 0.8 part of sodium polyacrylate.
4. The wall protection slurry for the underground continuous wall of the deep and large foundation pit of the round gravel stratum as claimed in claim 1, which is prepared from the following raw materials in parts by weight: 1000 parts of water, 83 parts of bentonite, 4.5 parts of soda ash and 1.2 parts of sodium polyacrylate.
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| CN111732373A (en) * | 2020-05-28 | 2020-10-02 | 浙江土工岩土科技有限公司 | Slurry for sand drift stratum underground continuous wall |
| CN114790092A (en) * | 2022-05-30 | 2022-07-26 | 广东电白二建集团有限公司 | Method for preparing slurry of slurry retaining wall type cast-in-situ bored pile |
| CN116445140A (en) * | 2023-02-22 | 2023-07-18 | 北京金河水务建设集团有限公司 | Long-distance pipe jacking drag reduction slurry and preparation method and application thereof |
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| EP0138594A3 (en) * | 1983-10-13 | 1986-02-12 | Exxon Research And Engineering Company | Stabilization of aqueous clay-based drilling fluids |
| US5391228A (en) * | 1990-12-21 | 1995-02-21 | Southern Clay Products, Inc. | Method for preparing high solids bentonite slurries |
| IT1255519B (en) * | 1992-09-24 | 1995-11-09 | Agip Spa | PRE-TREATED CLAYS, THEIR PREPARATION AND USE IN THE FORMULATION OF NON-AGGRESSIVE DRILLING SLUDGE TOWARDS THE LAYER CLAYS |
| US20090142143A1 (en) * | 2007-06-12 | 2009-06-04 | Peters Stanley R | Fly Ash Bentonite Slurry Mixture for Slurry Wall Construction |
| CN103408261A (en) * | 2013-08-22 | 2013-11-27 | 上海远方基础工程有限公司 | Wall protection mud for super-deep underground diaphragm wall |
| CN103755318A (en) * | 2014-01-03 | 2014-04-30 | 上海市基础工程集团有限公司 | Underground diaphragm wall grooving wall-protection slurry and method in red sandstone pebble bed |
| WO2016088141A2 (en) * | 2014-12-02 | 2016-06-09 | Indian Institute Of Technology Madras | Composition of drilling fluid and method useful in drilling boreholes in water sensitive formations |
| CN106675536A (en) * | 2016-12-24 | 2017-05-17 | 中铁四局集团有限公司 | Novel environment-friendly slurry preparing material and preparation method thereof |
| CN107129186A (en) * | 2017-04-21 | 2017-09-05 | 中铁四局集团有限公司 | A kind of ground-connecting-wall composite sludge |
| CN108395172B (en) * | 2018-03-14 | 2020-10-02 | 中南大学 | Complete wall protection slurry for super-long-distance large-diameter steel roof pipe penetrating through lake bottom goaf |
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